WO2019015969A1

WO2019015969A1 - Dishwasher comprising at least one fan impeller in the dishwashing compartment

Info

Publication number: WO2019015969A1
Application number: PCT/EP2018/068126
Authority: WO
Inventors: Stephan Lutz; Thomas BURGGRAF; Michael Georg Rosenbauer
Original assignee: BSH Hausgeräte GmbH
Priority date: 2017-07-18
Filing date: 2018-07-04
Publication date: 2019-01-24
Also published as: WO2019015964A1; WO2019015966A1; EP3654820B1; DE102017223272A1; WO2019015965A1; PL3654820T3; DE102017223261A1; PL3654814T3; CN110996747B; WO2019015968A1; CN110944561A; US20210145246A1; US20200093346A1; DE102017223258A1; EP3654820A1; CN110944560A; WO2019015967A1; DE102017223262A1; DE102017223271A1; DE102017223266A1

Abstract

A dishwasher (1), in particular a domestic dishwasher, comprising a dishwashing compartment (2) for receiving items of washware, such as tableware, glasses, cutlery or the like, for example, is designed such that at least one rotatable fan impeller (17) is arranged in the dishwashing compartment (2), it being possible firstly to draw in air and secondly to blow out air using said fan impeller, wherein a motor (18), the rotation speed of which can be varied over time, is associated with the at least one fan impeller (17).

Description

Dishwasher with at least one fan in

rinse tank

The present invention relates to a dishwasher, in particular a domestic dishwasher, with a washing container for receiving dishes, glasses, cutlery or the like Spülgutteilen according to the preamble of claim 1.

In a conventional washing program, a dishwasher passes through one or more liquid-conducting partial rinses, for example a pre-wash cycle, a cleaning cycle, an intermediate rinse cycle and a rinse cycle. Subsequently, a drying cycle is usually carried out. During the respective liquid-conducting Teilspülgangs liquid, in particular water, which may be optionally mixed with cleaning and / or rinse aid, i. so-called rinsing liquor, introduced via one or more Flüssigkeitsverteilvorrichtung (s) in the washing and distributed there. The respective liquid distribution device can be formed, for example, by a rotating spray arm, by a roof shower, and / or by a movable spray nozzle, such as a roof top. With their help, it is possible, in particular, to charge the washware parts held there in loading units, for example pull-out dish racks and / or cutlery drawers, directly or indirectly with rinsing liquor.

In order to dry the respective Spülgutteil as good as possible at the end of the wash program, various drying methods are known. These are in particular the so-called self-heat drying, condensation drying (in particular by means of a heat exchanger on a side wall of the washing to cool them), drying with the assistance of a fan system with Luftverschnitt by ambient air, drying through a door opening at the end of the drying cycle, Sorptionstrocknung with zeolite, etc These methods cause in particular that

Liquid droplets that adhere to the respective Spülgutteil after the last liquid-conducting Teilspülgang be dried away.

However, during the liquid-carrying partial rinses, rinse liquid accumulates in an upwardly projecting depression, eg. B. sink, throat or other cavity of a Wash item, and remains there on the top, this remaining liquid amount is often too large to be dried by a conventional drying system. This standing residual liquid can be removed after the end of the drying cycle usually only by manual tilting away from the top of the respective Spülgutteils and / or by drying by means of a tea towel by the user, which is uncomfortable and time consuming. In addition, such puddles in wells of Spülgutteilen after the drying cycle lead to unsightly, stubbornly adhering deposits or water edges, since in the stopped liquid dirt particles, cleaning agents, rinse aid, lime and / or other additives may be included after partial or complete drying the puddles can remain in the respective depression.

As a remedy, DE 10 2014 222 539 A1 provides for, inter alia, one or more blow-out opening (s) for supplying air to the rinsing container, to which a movable mechanical control means, such as an air baffle, a directionally variable nozzle, a movable flap or the like can be assigned , so that the outlet cross section and / or the outlet direction of the air varies over the drying phase.

The invention is based on the problem of providing an alternative drying option, with the help of which amounts of liquid in particular top-side wells, such as depressions, depressions, fillets or other cavities can be largely removed by one or more loading units held Spülgutteilen.

The invention solves the problem by an article having the features of claim 1 or claim 9. With regard to advantageous embodiments and developments of the invention, reference is made to the claims 2 to 8 and 10 to 21.

In the dishwasher according to the invention in accordance with claim 1 at least one rotatable fan wheel is arranged in the washing, with the air on the one hand and sucked on the other hand is blown, the at least one fan is associated with a motor whose speed is variable over time. As a result, for example, after the end of the liquid application operation of the last liquid-conducting partial rinse cycle, in particular rinse cycle, of the rinse cycle of the respective dishwashing program to be carried out for drying the one or more washware parts from the respective fan wheel over time, in particular with regard to their flow velocities or flow impulses, generate different airflows. In other words, depending on its speed, the respective fan wheel can deliver different degrees of airflow over time. Thus, according to an advantageous development of the invention, for example, after the end of the liquid charging operation of the last liquid-carrying Teilspülgangs, in particular rinse cycle, the wash cycle of the respective dishwashing program to be performed first the respective fan during a Abblasbetriebsphase with a high speed for blowing off the upper side, especially in wells on the Spülgutteilen remained liquid quantities and possibly thereafter during a subsequent or subsequent convection drying phase (to produce a forced convection in the receiving space of the washing container) are operated at a lower contrast speed.

By varying the speed of the respective fan wheel can be passed from this air flows varying flow velocity or varying flow pulse for drying on the items to be washed. With the speed variation also the noise level can be varied. Thus, the volume can be kept low over a large proportion of time, while a high speed, which is also associated with an increased noise level, is set only for a relatively short time.

At low speed convection / flow can be enforced in the washing, which is also effective between the parts of the dishes, so that shading areas are reduced. This flow improves the moisture removal on the dish surface. This may possibly reduce the rinse temperature and thus save energy. At high speed, however, such a high flow rate of the air stream emitted by the respective fan can be generated that water puddles are blown out, in particular upwardly projecting, cup trays, bowl bottoms or other, preferably top, recesses of Spülgutteilen over the edge of the respective recess and then Following the drying process only the wet, wetted with very small liquid droplets surface of Spülgutteile must be dried. In particular, a corresponding fan is driven by a variable speed motor. This may preferably be an electronically commutated synchronous motor, which may preferably be permanent magnet excited. Such an electronically commutated synchronous motor is easily adjustable in its speed.

If the at least one motor, which is assigned to the one or more fan wheels, can be operated in a speed range between 1500 rpm to 12000 rpm, the mentioned different operating ranges can be realized very effectively. Thus, when operating at 1000 to 5000 revolutions per minute, convection support at a low noise level is possible, whereas at a speed range of 5000 to 12000 revolutions, short-range blow-by can be performed. The then associated higher volume is acceptable for a short time, especially if the one or more short-term increases each take less than 120 seconds. Preferably, the speed increase of the respective fan associated motor, in particular electric motor, take about 90 seconds.

According to an advantageous embodiment of the invention, an increase in the speed of the respective fan associated motor is preferably carried out during a Abblasphase before the temporal subsequent continuous operation, the speed of the motor during the blow-off larger, in particular by at least 20% greater than the speed of the motor during the consecutive continuous operation. The blow-off phase may preferably take place after the end of the liquid application operation of the last liquid-carrying partial rinse cycle, in particular rinse cycle, when the circulation pump has stopped its operation or has such a low rotational speed that no rinsing liquid is flushed over the one or more spray devices or, more generally, liquid distribution devices and now meets the items to be washed. The continuous operation of the engine may preferably take place after the blow-off phase during a partial time period or the entire remaining period of the rinse-complete drying cycle of the rinse cycle of a dishwashing program to be carried out in the rinse tank. If a blocking of a fan wheel can be measured by measuring the motor current of a respective motor assigned to this fan wheel, it is easy to detect, for example, a blockage caused by a dishware projecting into the rotary circuit of the fan wheel. Overheating of the engine is avoided. The control or regulation of the at least one motor is preferably sensorless, but can also be realized with a sensor (eg Hall sensor, rotary encoder).

If in training according to claim 9 in the washing at least one rotatable fan is arranged with the air on the one hand and sucked on the other hand is blown, wherein the at least one fan is associated with an engine, which is designed as a wet rotor, it is not a problem, such engines in wasserbeaufschlagten washing to arrange. The stator area of the motor is then reliably protected against wetness by wet-runner design without great sealing effort. A specially provided axial and / or radial sealing of the rotor chamber and / or the bearing sleeve (s) for the shaft of the rotor relative to liquid penetrating in the dishwashing operation of the dishwasher is not required. Any liquid which has penetrated into the respective bearing sleeve and / or into the rotor gap of the wet-running motor preferably serves to lubricate the shaft and / or the rotor. If the respective motor with the end portion of its shaft, on which the fan is mounted in the rinse tank projects down, any liquid may penetrate from the respective bearing sleeve and / or out of the rotor gap may gravitationally run down again. Therefore, under some circumstances, it may be favorable to use the wet-rotor motor for a certain minimum duration of its associated fan wheel, in particular propeller, such as. for the duration of which during the respective blow-off phase, in which the rotational speed of the wet-rotor motor is briefly raised, dry-run form.

In particular, the wet rotor comprises a so-called split tube, which is in particular cup-shaped, It separates a wet-running rotor from a held in dry state. The engine therefore does not need a moving seal, which would cause losses in efficiency and would be subject to high wear over time. The service life of the wet-running motor is therefore significantly increased. Conveniently, the rotor may comprise a ferrite ring, wherein the particular one-piece or one-piece ferrite ring may have good emergency running properties in the can.

According to an advantageous embodiment of the invention, the split tube is advantageously formed of plastic, so that a good material pairing results to the ferrite and emergency running properties can be ensured in particular in the event of wear of one or more bearings of the shaft of the motor, so that it is not for looping through the Canned tube comes. This runflat property of the engine in the event of wear of the one or more bearings of the shaft can be improved in particular by ensuring that the rotor chamber is filled with water or another liquid medium or fills with rinsing liquid during the rinsing operation.

As described above, the engine may be free of a shaft seal. Any movable seal is unnecessary. In particular, this can be omitted at the entrance of the can between this and the shaft.

Preferably, the assembly of shaft and fixedly connected rotor in the pot of the split tube is rotatably mounted. A free end of the shaft protrudes from the canned pot. At this the fan, in particular a propeller or impeller, is attached.

In particular, a rotary bearing of the shaft and of the rotor, which is preferably firmly connected thereto, may be favorable. For such a rotating bearing preferably an inner, in particular fixedly arranged, elongated bearing sleeve is provided in which a the fan, in particular propeller, facing away from the shaft is rotatably mounted. This inner bearing sleeve thus provides over its axial longitudinal extent one or more radial bearing points, or over its axial longitudinal extent largely continuous radial bearing for the shaft ready. It expediently has an axial longitudinal extent, which corresponds approximately to the axial length of the rotor. In particular, it can assume the function of a conventional shaft bearing with a first radial bearing, ie so-called A bearing in front of the rotor and a second radial bearing, ie so-called B bearing after the rotor (viewed from the fan wheel towards the bottom of the can). The shaft is preferably with the one or more magnets, in particular a ferrite ring receiving, magnetic carrier of the rotor firmly connected. This magnetic carrier is designed as a coupling element. The magnetic carrier or the coupling element is preferably in the form of a sleeve with bottom, ie cup-shaped. The shaft is perpendicular to the bottom of the pot-shaped coupling element and runs from the fan wheel facing the input opening to the center of the bottom of the cup-shaped coupling element. In particular, the front end of the shaft facing away from the fan wheel, in particular the propeller, is guided through a passage opening in the center of the bottom of the sleeve-shaped coupling element and is held against rotation therefrom (from the opening of the cup-shaped coupling element). The cylinder jacket, in particular circular cylinder jacket, of the sleeve-shaped coupling element may possibly have a radial gap distance to the outer surface, in particular cylinder jacket surface, of the inner bearing sleeve. It is preferably arranged concentrically to the inner bearing sleeve. The inner bearing sleeve is inserted with a part facing away from the fan, in particular propeller, preferably with its end portion facing away from the fan, or possibly with its total extension in the cylinder jacket of the cup-shaped coupling element. Outside around the circular cylinder shell of the sleeve-shaped coupling element sit one or more rotor magnets, in particular permanent magnets, or a magnetic ring and are or is supported there. In particular, a ferrite ring can be arranged and fixedly mounted on the outer circumference of the sleeve-shaped coupling element. Thus, the coupling element and the one or more rotor magnets firmly seated on its cylinder jacket, in particular permanent magnets, form the rotor. The rotor rotates while the fixedly arranged, inner bearing sleeve in the rotational operation of the engine. The fan facing away from the end face of the fixed inner bearing sleeve forms (viewed along the central axis of the shaft) a stop ring for the bottom of the sleeve-shaped coupling element. It provides a thrust bearing for the sleeve-shaped coupling element in the rotational operation of the drive motor. As a result, it is avoided during rotational operation of the electric drive motor that the shaft, together with the rotor, migrates out of the canned pot in the direction of the suction side of the fan wheel. Thus, the inner bearing sleeve in multiple function at least provide a radial bearing for the shaft, in particular a radial double plain or radial multiple plain bearings, and at the same time a thrust bearing for the unit of drive shaft, coupling element and one or more rotor magnet or magnet ring. Due to this advantageous construction of the electric drive motor, the shaft with her arranged inside the canned pot, the fan opposite end portion of the shaft to which the rotor is externally mounted with its magnetic carrier or coupling element mounted on one side. This results in a compressed in the axial direction (along the shaft), flat construction of the drive motor. Compared to a conventional drive motor, each with a dedicated bearing for the shaft before and after the rotor, it is shortened in terms of its axial extent.

Preferably, the material of the coupling element is selected differently from the material of the inner bearing sleeve, so that the fan wheel facing inner surface of the bottom of the coupling element largely friction on the end facing away from the fan wheel of the inner bearing sleeve, in particular during start-up of the engine, can slide. Between the bottom of the coupling element and the end face of the inner bearing sleeve, it can due to their favorable material pairing to no unduly large abrasion, i. Wear come. In particular, a metal is selected for the coupling element, while the inner bearing sleeve is made of a plastic material. The preferably made of a plastic material, inner bearing sleeve for receiving a portion, in particular end portion of the shaft of the rotor is advantageously offset or provided with PTFE, carbon graphite or other friction reducer and / or externally coated. For the shaft is advantageously chosen a material different from the material of the bearing sleeve material. In particular, it is preferably made of a metal, e.g. Made of stainless steel. This results in a very low-wear and maintenance-free storage of shaft and / or rotor, which works reliably even in continuous operation for many years and also has very favorable dry-running properties, since a dry run can not be excluded.

The wet-running engine can also be advantageously combined with the above-mentioned speed characteristics according to one of claims 1 to 8, so that special synergy advantages are formed. Each fan may be provided with its own drive motor to minimize losses in power transmission. The drive motor associated with the respective fan wheel can preferably be arranged axially above the fan wheel, so that in each case a compact unit with only a very small construction height is formed from the drive motor and the fan wheel. In particular, the respective fan is designed as axial fan. The electric drive motor assigned to it is designed and / or arranged such that its shaft protrudes in particular vertically downwards. Conveniently, the fan wheel is attached to the downwardly projecting, free end of the shaft. At the side facing away from the fan, vertically upwardly projecting end portion of the shaft, which is housed in the canned pot together with the attached thereto rotor unit, the shaft is rotatably mounted in the fixed, inner bearing sleeve. At the same time, the upwardly projecting end face of the inner bearing sleeve for the coupling element of the rotor unit provides a thrust bearing which in the axial direction on the fan wheel prevents axial movement of the shaft with the rotor unit out of the canned pot when the electric drive motor is in operation. If in a liquid-conducting partial wash cycle, such as the cleaning cycle of the wash cycle of a dishwashing program to be carried out, rinsing liquid is distributed, in particular sprayed, in the interior of the washing container by means of one or more liquid distributing means, the rinsing liquid can possibly enter from below also into the rotor chamber of the drive motor provided by the canned pot and there provide fluid lubrication to the shaft and / or rotor. This can be favorable for a chronologically later rotational operation of the drive motor, for example during a blow-off phase and / or the drying cycle of the rinse cycle.

In particular, the drive motor has an axial extent of less than four centimeters, which allows the total assembly height of the motor and fan wheel is less than five centimeters. Thus, the remaining space for the dishes is very limited.

In addition, it is possible for one or more fan wheels of a cutlery drawer and / or one or more fan wheels to be assigned to a dish rack and to use a common frame with this or this one. Then no own frame for the mechanical support of the fan wheels are needed, but they can use the already existing loading units. A retrofit, such as an Anklipsen to such loading units may possibly be possible. The height and the Number of components can be reduced again. If one or more fan wheels is or are held on a lower side of a respective loading unit, the capacity of the respective loading unit is not restricted by the fan wheel (s), but remains over its full area. If one or more fans suck and blow air out of the closed rinse tank, no outlets in the rinse tank wall and no valves or other additional assemblies are required, so the structure remains simple. Alternatively, it is also possible that air is sucked from the outside, for example, by the door is automatically opened a gap.

The above-described advantageous embodiments and further developments of the invention can advantageously be used individually or else in any combination with one another. Other advantageous developments of the invention are given in the dependent claims.

The invention and its advantageous embodiments and further developments and their advantages will be explained in more detail with reference to exemplary embodiments illustrative drawings. They show, in each case in a schematic outline sketch:

1 is a schematic perspective view obliquely from the front of an advantageous embodiment of a dishwasher with a front door here and a washing container inside,

2 shows a side view of an exemplary washing container with two loading units equipped with items to be washed and with a plurality of fan wheels in the upper area, which can apply air to the washing container, the washing container in front view,

Fig. 4 is a detail view of a fan with a vertically overlying drive motor for this, and Fig. 5 is a plan view of the above-arranged fan wheels, which are held here by way of example on a common frame in a square arrangement.

In FIGS. 1-5, corresponding parts are provided with the same reference numerals. Only those components of a domestic dishwasher are provided with reference numerals and explained which are necessary for the understanding of the invention.

The dishwashing machine 1 shown schematically in FIG. 1 is a household dishwashing machine. This has as part of a partially open to the outside or closed device body 5, which is often referred to as a body, a washing container 2 for receiving items to be washed items such as dishes, pots, cutlery, glasses, cooking utensils u. on. The respective items to be washed can be, for example, in loading units 10, 1 1, namely according to the drawing in crockery 1 1 and / or a cutlery drawer 10, halterbar and thereby be acted upon by so-called. Flushing. Here, by way of example, two baskets 1 1 one above the other and in the upper region of the washing container 2, an additional cutlery drawer 10 is arranged. This arrangement is not mandatory. For bulky items to be washed can be removed from the customer, for example, an upper dish rack 1 1 or the cutlery drawer 10 for a specific rinse.

Flushing liquor is understood to mean fresh or, in particular, circulating water during operation with or without cleaning agent and / or rinse aid and / or drying agent. The rinsing container 2 may have an at least substantially rectangular-in particular approximately square-ground plan with a front side V facing a user in the operating position. This front V can form a part of a kitchen front of kitchen furniture standing side by side or even be without reference to other furniture in a stand-alone device. The washing container 2 can be closed by a door or flap 3, in particular on this front side V. This door 3 is shown in Figure 1 in partially open and then inclined to the vertical position. In its closed position, however, it stands upright and is according to the drawing to its opening to a lower horizontal axis after can be pivoted upwards and downwards in the direction of the arrow 4, so that it is at least almost horizontal in the completely open position.

At its in the closed position, the user facing the outside and front V, the door 3 may be provided with a decorative plate 6, so as to experience a visual and / or haptic appreciation and / or adaptation to surrounding kitchen furniture.

The dishwasher 1 is designed here as a stand-alone or as a so-called. Semi-integrated or as a fully integrated device. In the latter case, the device body 5 can also be substantially complete with the outer walls of the washing compartment 2. A surrounding this exterior housing can then be dispensed with. In the lower area of the dishwasher, a base 12 can be used, in particular for receiving functional elements, such as e.g. also a circulation pump for the rinsing water, are. The movable door 3 is assigned in the embodiment according to the drawing in its upper part a transverse direction Q of the dishwasher extending control panel 8, which may include an accessible from the front V engagement opening 7 for manually opening and / or closing the door 3. In the transverse direction Q, the dishwasher often has an extension of 45, 50 or 60 centimeters. In the depth direction from the front V to the rear, the extension is often also at about 60 centimeters. The values are not mandatory.

The washing container 2 is circumferentially bounded by a total of closed door or flap 3 three fixed vertical walls 13 and two horizontal walls 15, one of which forms a ceiling (top) and another a bottom (bottom) of the washing compartment 2. The wall 14 arranged towards the front V, towards a user standing in front of the dishwasher 1 and movable here, forms an internal component of the movable door or flap 3. The wall 15 forming the bottom of the washing container 2 and delimiting it substantially downwards lies approximately horizontally, that is to say parallel to an outer bottom B on which the dishwasher 1 stands. In the washing container 2, at least one rotatable fan 17 is arranged, with the air on the one hand and sucked on the other hand is blown, wherein the at least one fan 17, a motor 18 is assigned, whose speed is variable over time:

At low speed convection / flow in the interior of the washing container 2 or flow between the parts of the dishes is enforced. This - relatively slow - flow improves the removal of moisture on the bowl surface. This can reduce the rinse temperature and thus save energy.

At high speed, however, such high flow velocities are generated that water puddles in cup floors, bowl bottoms or other, in particular top, recesses are blown out over the respective edge of the dish. In the subsequent drying process then only the surface must be dried. The variation of the speed can either be stored in a controller or as a regulation under determination of drying parameters each made different and adapted.

FIG. 5 shows by way of example a symmetrical arrangement of four fan wheels in a common plane. Also, for example, only a large central fan or two or three fans in the common plane, possibly within a common frame 16, would be possible.

The fan 17 or the fan wheels may or may be mounted close to the top cover 15 of the washing container 2 by way of example (FIGS. 2, 3) or alternatively also between the loading planes 10, 11 (not shown). In FIGS. 2 and 3, an upper cutlery drawer 10 is not provided. In its place, the frame 16 with the fan wheels 17 is inserted here. Above each fan 17, a separate motor 18 driving it can be arranged. Alternatively, several fan wheels 17 can be driven by a common motor - not shown here.

The at least one motor 18 is here a brushless, permanent magnet-excited synchronous motor whose speed is easy to control and / or controllable. In particular the motor 18 has an electronic commutation and preferably works sensorless, but can also be realized with a sensor (Hall sensor, rotary encoder, ...).

The at least one motor 18 may be operable, for example, in a speed range between 1500 revolutions to 12000 revolutions per minute, so that the above-mentioned different operating modes result at low and at high rotational speeds.

Thus, the or each motor 18 may be operable in a continuous mode for the first mode of operation in a speed range of below 5000 rpm during a program phase, for example, the drying phase. In this speed range, both volume and frequency of the motor and fan movement are acoustically pleasing. In this mode, the described convection support can be operated.

From this speed range for the second mode of operation short-term increases in a high speed range of 5000 to 12000 revolutions per minute feasible, for example, such that the short-term increases each less than 120 seconds, preferably about 90 seconds last. In this mode of operation, the cavities, depressions, etc., can then be blown out, which can be acted upon with high air flow and a flow component downwards. The higher flow noise is well acceptable for this mode of operation because of the short interval that can be repeated several times. Preferably, an increase in the rotational speed of the respective fan associated with the motor during a blow-off before the temporal subsequent continuous operation is feasible, the speed of the motor during the blow-off larger, in particular by at least 20% greater than the speed of the motor during the temporally subsequent continuous operation , The blow-off phase may preferably take place after the end of the liquid application operation of the last liquid-conducting partial rinse cycle, in particular rinse cycle, when the circulation pump has stopped its operation or has such a low rotational speed that no rinsing liquid is more expressed via the one or more spray devices or more generally Fluid distribution on the rinsed and now to be washed Spülgutteile meets. The continuous operation of the engine may preferably take place after the blow-off phase during a partial time period or the entire remaining period of the rinse-complete drying cycle of the rinse cycle of a dishwashing program to be carried out in the rinse tank.

In addition, a blocking of a fan wheel 17, for example due to improper loading, is conveniently detectable by measuring the motor current of a respective motor 18 associated with this fan wheel 17. A corresponding warning signal can then be output.

It is thus an on-demand operation of the fan wheels 17 with high efficiency and cost advantages in compliance with safety standards allows. Regarding the life, the quality is optimized. In addition, there are wear and noise advantages.

The motor 18 shown in detail here in FIG. 4 for driving the fan wheel 17 is designed as a wet rotor, that is to say in FIG. h., At least the rotor 22 rotates in the wet region 26 and has a wet lubrication through the wash liquor. The rotor 22 rotates the shaft 19 rotatably supported via a bearing 21, in particular a bearing sleeve, and then the impeller 17 via the fan hub 20. The rotor 22 may be formed, in particular, by a ferrite ring.

Furthermore, the motor 18 designed as a wet rotor comprises a so-called split tube 23, which is approximately pot-shaped and which separates the wet-running rotor 22 from a stator 24 held in the dry space 25.

The ferrite ring as a rotor 22 has in the can 23, especially if this is made of plastic, some emergency running properties, so that any dry run, which can not be excluded, without lubrication by the wash liquor does not cause damage to the motor 18 and not a looping through the gap tube 23 comes. The drive can therefore be designed free of a shaft seal or other moving seal. Durability is improved, wear is reduced. This runflat property of the engine can be particularly characterized it can be ensured that the rotor chamber 26 is filled with water or another liquid medium or that it is filled with rinsing liquid during the rinsing operation. Because then a free, in particular liquid-filled gap between the rotor 22 and the gap tube 23 is obtained, without causing it to tarnish the rotor on the can.

In particular, for the radial mounting of the shaft 19, an inner, in particular fixedly arranged, bearing sleeve 21 is provided on one side on a shaft section remote from the fan wheel, arranged in the gap tube 12. In this, the fan wheel 17 remote from the portion of the shaft 19 is rotatably mounted, around which outside a rotor with its rotor magnet or its magnetic ring, preferably ferrite magnet ring, preferably substantially concentric, is arranged. This inner bearing sleeve 21 preferably provides a radial bearing extending over the axial extent of the rotor, or in particular a double radial bearing, or a multiple radial bearing with more than two radial bearing points for the shaft 19. It replaces a conventional rotary bearing of the shaft with an A bearing in front of the fan wheel facing front end of the rotor and with a B-bearing behind the fan facing away from the rear end of the rotor. The shaft 19 is preferably fixedly connected via a coupling element 30 of the rotor 22. The coupling element 30 is preferably in the form of a sleeve with bottom 31, ie cup-shaped. The shaft 19 is perpendicular to the bottom 31 of the cup-shaped coupling element 30 and runs from its the fan 17 facing the inlet opening to the center. In particular, the front end of the shaft facing away from the fan wheel 17 (from the opening of the cup-shaped coupling element 30) is passed through a passage opening in the center of the bottom 31 of the sleeve-shaped coupling element 30 and gripped against rotation there. The cylinder jacket 32, in particular circular cylinder jacket, of the sleeve-shaped coupling element 30 preferably has a radial gap distance 33 to the outer surface of the inner bearing sleeve 21. It is preferably arranged concentrically to the inner bearing sleeve 21. The inner bearing sleeve 21 is thus inserted with a part facing away from the fan 17, in particular with its end facing away from the fan, or with their total extension in the cylinder jacket 32 of the cup-shaped coupling element 30. This results in an axial direction (along the shaft considered) crowded, flatter Structure of the drive motor 18. Against a conventional drive motor with a bearing for the shaft before and after the rotor, it is shortened in its axial extent. Outside around the circular cylinder shell of the sleeve-shaped coupling element sitting on one or more permanent magnets and are held there. The coupling element thus forms the magnetic carrier of the rotor. In particular, a ferrite ring can be arranged and mounted on the outer circumference of the sleeve-shaped coupling element. Thus, the coupling element 30 and the one or more seated on its cylinder shell 32 rotor magnets, in particular permanent magnets, the rotor or the rotor unit 22. The rotor 22 thereby rotates the preferably stationary, inner bearing sleeve 21 in the rotary operation of the motor 18. The the fan remote end face of the inner bearing sleeve forms (viewed along the central axis of the shaft) a stop ring for the bottom of the sleeve-shaped coupling element. It provides a thrust bearing for the sleeve-shaped coupling element 30 or for the rotor unit in the rotational operation of the drive motor. This results in a combined radial and thrust bearing for the unit consisting of drive shaft, coupling element and one or more rotor magnets. Preferably, the material of the coupling element 30 is selected differently from the material of the inner bearing sleeve 21, so that the fan wheel 17 facing inner surface of the bottom 31 of the coupling element 30 largely friction on the fan facing away from the end face of the inner bearing sleeve 21, in particular during startup of the motor 18, can slide. Between the bottom of the coupling element and the end face of the inner bearing sleeve, it can due to their favorable material pairing to no inadmissibly large abrasion, ie wear come. In particular, a metal is selected for the coupling element 30, while the inner bearing sleeve 21 is made of a plastic material. This may conveniently be added to a friction reducer such as graphite, carbon, PTFE, or the bearing sleeve may be provided with an outer layer of a friction reducer. For the shaft 19 is advantageously selected from the material of the bearing sleeve 21 different material. In particular, it is preferably made of a metal such as stainless steel. This results in a very low-wear and maintenance-free storage of shaft and / or rotor, which works reliably even in continuous operation for many years and also has sufficiently favorable dry-running properties, since a dry run can not be excluded. This special design of the motor (s) 18 is particularly advantageous combined with the described speed variation according to one of claims 1 to 8. The one or more motors 18 may be arranged axially directly above their associated fan wheels 17, so that each of the drive motor and fan a compact unit is formed with only a very small construction height. In particular, the respective fan is designed as axial fan. The electric motor associated with it is designed and / or arranged such that its shaft protrudes in particular vertically downwards. Conveniently, the fan wheel is attached to the downwardly projecting, free end of the shaft. At its end facing away from the fan, it is - as described above - preferably mounted only on one side. If in a liquid-conducting partial wash cycle, such as the cleaning cycle of the wash cycle of a dishwashing program to be carried out, rinsing liquid is distributed, in particular sprayed, in the interior of the washing container by means of one or more liquid distributing means, the rinsing liquid can possibly also enter from below into the rotor chamber of the drive motor provided by the canned pot and there provide fluid lubrication to the shaft and / or rotor. This can be favorable for a chronologically later rotational operation of the drive motor, for example during a blow-off phase or the drying cycle of the rinse cycle.

In particular, the respective drive motor 18 has an axial extent of less than four centimeters, in which case the overall height of construction of the motor 18 and the fan wheel 17 is very advantageously less than five centimeters. The restriction on the remaining loading height in the washing container 2 is thereby minimized.

The frame 16 may also be part of a loading level 10, 1 1, so that the one or more fan wheels 17 are associated with a cutlery drawer 10 and / or a dish rack 1 1 directly. The overall height is minimized, the design effort is low.

An electrical contacting of the motors 18 can be ensured via branched off from a central channel 28 and sealed cable channels 27. LIST OF REFERENCE NUMBERS

1 home appliance,

2 washing containers,

3 door,

4 opening direction,

5 device bodies,

6 decorative plate,

7 recessed grip,

8 control panel,

10 cutlery drawer,

1 1 crockery basket,

12 sockets,

13 vertical wall,

14 movable wall,

15 cover or bottom of the washing container,

16 frames,

16a mechanical mounts,

17 impeller or impeller (especially propeller),

18 drive motor,

19 motor shaft,

20 bearings of the propeller,

21 bearing of the shaft,

22 rotor,

23 can,

24 stator,

25 dry room,

26 wet room,

27 branching channels,

28 central channel,

30 coupling element

31 bottom of the coupling element

32 cylinder jacket of the coupling element radial gap distance

Rotor magnet (s)

Front,

Transversely

ground

Claims

claims

Dishwasher (1), in particular domestic dishwasher, with a rinsing container (2) for receiving washware, such as dishes, glasses, cutlery or the like,

characterized,

that in the washing container (2) at least one rotatable fan (17) is arranged, with the air on the one hand and sucked on the other hand is blown, wherein the at least one fan (17) is associated with a motor (18) whose speed is variable over time.

Dishwasher (1) according to claim 1,

characterized,

in that the at least one motor (18) is an electronically commutated, permanent magnet-excited synchronous motor.

Dishwasher (1) according to one of claims 1 or 2,

characterized,

in that the at least one motor (18) is operable in a speed range between 1500 rpm and 12000 rpm.

Dishwasher (1) according to one of claims 1 to 3,

characterized,

in that the at least one motor (18) can be operated continuously in a speed range of less than 5000 revolutions per minute during a program phase and, deviating from this speed range, one or more short-term boostings into a higher speed range can be carried out.

Dishwasher (1) according to claim 4,

characterized,

that the one or more short-term increases each take less than 120 seconds.

Dishwasher (1) according to one of claims 4 or 5,

characterized,

that an increase in the rotational speed of the motor (18) during a blow-off before the temporal subsequent continuous operation is feasible, wherein the speed of the motor (18) during the blow-off greater, in particular by at least 20% greater than the speed of the motor (18) during the temporally subsequent continuous operation is.

Dishwasher (1) according to one of claims 1 to 6,

characterized,

a blocking of a fan wheel (17) can be measured by measuring the motor current of a motor (18) associated with each fan wheel (17).

8. Dishwasher (1) according to one of claims 1 to 7,

characterized,

the motor (18) is controlled or regulated to the respectively desired rotational speed, in particular sensorless.

Dishwasher (1), in particular household dishwasher, with a rinsing container (2) for receiving items of items to be washed, such as dishes, glasses, cutlery or the like, in particular according to one of the preceding claims,

characterized,

that in the washing container (2) at least one rotatable fan (17) is arranged, with which air on the one hand and sucked on the other hand is blown, wherein the at least one fan (17) is associated with a motor (18), which is designed as a wet rotor.

Dishwasher (1) according to claim 9,

characterized,

in that the wet rotor comprises a so-called split tube (23) which separates a wet-running rotor (22) from a dry-held stator (24).

1 1. Dishwasher (1) according to one of claims 9 or 10, characterized,

the rotor (22) comprises a ferrite ring.

Dishwasher (1) according to claim 1 1,

characterized,

the ferrite ring in the split tube (23) has runflat properties.

Dishwasher (1) according to one of claims 10 to 12,

characterized,

that the split tube (23) is formed of plastic.

Dishwasher (1) according to one of claims 9 to 13,

characterized,

that the motor (18) is free of a shaft seal.

Dishwasher (1) according to one of claims 9 to 14,

characterized,

a construction of the respective motor (18) with a radial bearing, in particular with a double sliding bearing, of the shaft (19) of the motor, in particular in the region of its rotor (22), is provided.

16. Dishwasher (1) according to one of claims 9 to 15,

characterized,

in that for at least a portion of the shaft (19) of the respective motor (18) a bearing sleeve is provided with PTFE or another friction reducer.

17. Dishwasher (1) according to one of claims 9 to 16,

characterized,

in that the motor (18) is designed according to one of claims 1 to 8.

18. Dishwasher (1) according to one of claims 1 to 17,

characterized,

in that the motor (18) is arranged above the respective fan wheel (17). Dishwasher (1) according to one of claims 1 to 18,

characterized,

that the motor (18) has an axial extent of less than four centimeters.

Dishwasher (1) according to one of claims 1 to 19,

characterized,

that the total height of the motor (18) and fan (17) is less than five centimeters.

Dishwasher (1) according to one of claims 1 to 20,

characterized,

in that one or more fan wheels (17) of a cutlery drawer (10) and / or one or more fan wheels (17) are associated with a dish rack (11).